Pilot-burner control



Qct. 2, 1923.

F. W. POWERS PILOT BURNER CONTROL Filed March 6, 1922 Patented 0a. 2, 1923.

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FRED w. POWERS, OI CHICAGO, ILLIIWOIB, ASSIGNOB IO-THE POWERS REGULATOR COIPANY, OF CHICAGO, ILLINOIS, A CORPORATION OI ILLINOIS.

PILOT-BURNER CONTROL.

application filed Ieroh e, 1922. Serial in. 541,608.

To all whom it may concern:

Be it known that I, Fnnn W. Pownns, a citizen of the United States and resident of Chicago, in the county of Cook and State of Illinols, have invented certain new and useful Im rovements in a Pilot-Burner Control, of w ic-h the following is a specification.

My invention relates to regulating devices and particularly to adevice a ted to reduce the quantity of gas receive or the pilot burner.

In all liqu1d fuel burners arranged for automatic control it is customary to employ a ilot burner, the function of which is to e ect relighting of the main burner whenever necessary. Naturally therefore, the pilot must remain in operation at all times. In order to effect the relighting function with certainty a pilot of substantial size must be provided and this entails the consumption of a considerable amount of gas which however is unnecessar at those times when the main burneris s ut off.

An object of my invention is to provide means whereby the interruption of the supply of fuel to the main burner serves to effect a shut off of the supply of fuel to the pilot burner, with the exception of a small amount necessary to maintain the burner in operation. To that end, I provide a gas shut-off valve adapted to be maintained in open position by pressure of fuel or air as supplied to the main burner together with a bypass around the valve, through which by-pass a suflicient quantity of gas is constantly delivered to maintain the pilot burner in operation. v

The invention will be more readily understood by reference to the accompanying drawings, in which:

Figure 1 is a diagrammatic view showing an arrangement such as contemplated-by me and,

Figure 2 is an enlarged sectional view through a gas control valve adapted to be employed in connection therewith.

In the drawings conventional form of heater is indicated at 10,i nto which aburner 11 projects in the usual manner. A motor 12 is employed to supply fuel to the burner by means of the pump 13 and the conduit 14. Air for use in assistin combustion and for breaking up the liqui fuel is supplied by the pump 15 and conduit 16.

A pilot burner is indicated at 17 this being preferably of the Bunsen type. Gas is suplied to the burner 17 through the conuit 18. l

A gas control valve 19 is located in the p ilpe 18 it being mounted in a casing 20.

ithin the casing is a passage 21, around the valve the effective size of the pgssage or by-pass being varied at will bygfieans of a restricting valve 22, in the formiof a set screw. Secured to the valve casing 20 is a frame 23 containin a bellows 24 one side of which is anchore to the frame and its other side is abutted against a lunger 25 which contacts the valve 19. .small bellows 26 is provided to eliminate the necessity for a packing gland around the plunger 25. A spring 27 tends to close the valve 19, it being shown in open position in Figure 2.

A branch pipe connected by a T to the pipe 16 serves to place the interior of the bellows 2 1 in communication with the air pressure developed by the motor 15 such pressure tending to expand the bellows and to open the valve 19 by overcoming the force exerted by thespring 27.

The operation is as follows:

Assuming that the main burner is not being supplied with fuel and air due to shutting off of the motor 12, the valve 19 will be closed and a very small quantity of will be constantly delivered to the pi ot burner through the by-pass 21, the amount being only that sufiicient to keep the burner in operation. Whenever, due to thermostatic control or otherwise the motor is energized, air pressure will be developed which as an incident of its main purpose, will serve to expand the bellows 24 and open the gas valve 19 allowing a larger quantity of gas to pass to the pilot burner 17. Thus the main burner will be ignited with certainty. Upon reversal of the conditions stated the amount of gas supplied to the pilot burner will be reduced to a minimum.

It is apparent that in an arrangement such as described the desired result might be effected in the same manner by employing the liquid fuel ressure instead of the air pressure and in t e accompanying claims the terms employed should be construed as covering this and similar modifications.

I claim: 1. In a device of the class described the combination of a-fuel burner, a pilot burner, a conduit for deliverin gas to the pllot burner, a conduit for de ivering fuel to the fuel burner, a conduit for delivering an under pressure to the fuel burner, a valve 1n said gas conduit for limiting the supply to the pilot burner, means providlng a by-pass for maintainin a constant reduced supply of-gas to the pilot, and means operable by said air under pressure for moving sald valve.

2. In a device of the class described, the combination of a fuel burner, means for supplying fuel and air under pressure to said burner, a gas pilot burner, a valve for controlling said pilot burner, means providing a constantly open passage for gas to said pilot burner irrespective of the posi-' tion of said valve, and means operable by said pressure producing means for the fuel and air for maintaining said valve in open position and for permitting the closing of said valve on the interruption of the pressure of fuel and air.

3. In a device of the class described, the combination of a fuel burner means for supmeaaec plying fuel and air under pressure thereto, a pilot burner, a valve for controlling the supply of gas to said pilot burner, means providing a constantl open passage around said valve to said pi ot burner, and means operable by the pressure of fuel or air for opening said gas valve whereby a relatively large volume of as is supplied to the pilot burner and for cIosing said valve upon the interruption of the pressure of fuel or air and thereby interrupting the supply of gas to the pilot burner throu h said valve.

4. In a device of the CfilSS described, combination of a fuel burner, a pilot bearer, a conduit for delivering gas to the ilot burner, means for deliverin fuel an air under pressure to said fuel urner, a valve in said gas conduit, means providing a bypass around said valve whereby a constant reduced supply of gas is furnished to said pilot burner, and means operable by the air pressure for moving said valve.

Signed at Chicago, Illinois, this 28th day of February, 1922.

FRED W. POWERS. 

